US4780235A - Paint remover - Google Patents

Paint remover Download PDF

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Publication number
US4780235A
US4780235A US07/039,117 US3911787A US4780235A US 4780235 A US4780235 A US 4780235A US 3911787 A US3911787 A US 3911787A US 4780235 A US4780235 A US 4780235A
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composition
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nonhalogen
solvent
acid
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US07/039,117
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Harold L. Jackson
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EIDP Inc
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EI Du Pont de Nemours and Co
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Priority to US07/039,117 priority Critical patent/US4780235A/en
Assigned to E.I. DU PONT DE NEMOURS AND COMPANY, WILMINGTON, DE., A CORP OF DE. reassignment E.I. DU PONT DE NEMOURS AND COMPANY, WILMINGTON, DE., A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JACKSON, HAROLD L.
Priority to CA000563857A priority patent/CA1310255C/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00—Chemical paint or ink removers
    • C09D9/005—Chemical paint or ink removers containing organic solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D9/00—Chemical paint or ink removers
    • C09D9/04—Chemical paint or ink removers with surface-active agents

Definitions

  • This invention relates to a composition of matter suitable for use as a paint remover.
  • the composition is less hazardous to use than conventional paint remover.
  • a common commercially available class of paint remover contains a high percentage of methylene chloride. Although methylene chloride based paint removers are inexpensive and quite effective, such paint removers may be hazardous to the health of the user if not properly handled.
  • U.S. Pat. No. 2,507,983 discloses methylene chloride based paint removers.
  • N-methyl-2-pyrrolidone based materials As a less hazardous substitute for methylene chloride based paint removers, N-methyl-2-pyrrolidone based materials have been proposed. Such materials are effective, but also quite expensive. Paint removers based on N-methyl-2-pyrrolidone are disclosed in U.S. Pat. No. 4,120,810.
  • compositions containing dialkyl esters of succinic glutaric and adipic acid have been disclosed.
  • German Pat. No. 3,438,399 shows such a paint removing composition.
  • the present invention is a paint removing composition which comprises (a) at least 20% by weight of, at least one C 1 to C 4 dialkyl ester of a C 4 to C 6 aliphatic dibasic acid, (b) 0.1 to 5% by weight of an activator, (c) an effective amount of a thickener, (d) an effective amount of a compatible surfactant, and (e) from 1 to 80% by weight of at least one nonhalogen-containing-organic solvent.
  • Activators for the paint removers of this invention are of two different types, i.e., basic activators such as ammonium hydroxide and monoethanolamine, and acidic activators such as formic acid, acetic acid and oxalic acid.
  • Suitable nonhalogen-containing-organic solvents are preferably those that have high flash points, i.e., above about 140° F.
  • Such solvents include N-methyl-2-pyrrolidone, esters of monoalkyl ethers of dipropylene glycol, and esters of monoalkyl ethers of tripropylene glycol, and blends of hydrocarbons sometimes called "heavy aromatic naptha"--See U.S. Pat. No. 4,120,810, column 3.
  • composition of the invention also contains an effective amount of at least one thickener.
  • suitable thickeners for paint removers are known in the art and include ethylcellulose, hydroxypropyl cellulose, organic modified clay and hydrogenated castor oil.
  • the amount of thickener required depends in part on the other ingredients present in the composition, but in general an amount between about 0.5 and 10% by weight is effective.
  • the final ingredient required by the composition is an effective amount of a compatible surfactant.
  • the surfactant is primarily included in the composition to enhance the water wash of the substrate to remove the paint residue and the other ingredients from the substrate.
  • Suitable surfactants include potassium oleate, the dioctyl ester of sodium sulfosuccinic acid, sodium alkyl napthalene sulfonate, sodium alkyl benzene sulfonate and the like.
  • the paint remover of this invention comprises at least 20% and preferably at least 40% by weight of at least one C 1 to C 4 dialkyl ester of at least one C 4 to C 6 aliphatic dibasic acid.
  • the dialkyl ester in most cases will be of a mixture of C 4 to C 6 aliphatic dibasic acid. Mixtures of C 4 to C 6 dibasic acids are a byproduct of the manufacture of adipic acid--an acid that is used commercially on a large scale in the production of some types of nylon. Suitable dialkyl esters for use in the present invention are obtained by the esterification of such a byproduct stream.
  • composition of such a byproduct stream varies considerably, but in general will contain about 15 to 30 percent succinic acid, 50 to 73 percent glutaric acid, and about 6 to 25 percent adipic acid.
  • the methyl esters of such a mixture of acids is usually the most economically attractive, but ethyl, propyl and butyl esters are also useful.
  • the other solvent in the paint remover is a nonhalogen-containing-organic solvent.
  • Nonhalogen-containing solvents which may be used in conjunction with the dibasic ester are of two types.
  • One is a functional group-containing solvent which can have the effect of increasing removal effectiveness on a particular type of substrate or can modify the performance of a thickener.
  • This type solvent may make up 1 to 50% by weight of the paint remover composition.
  • Preferred are high flash point solvents such as N-methyl-2-pyrrolidone, and esters of dipropylene and tripropylene glycol ethers.
  • nonhalogen-containing solvents which can be used but may be less desirable because of toxicity, cost, odor or volatility are C 1 to C 12 alcohols, including isopropanol and benzyl alcohol; ethers of ethylene and propylene glycols and their esters; C 3 to C 12 ketones including acetone, diacetone alcohol and acetophenone; acetate esters of C 1 to C 12 aliphatic alcohols; organic nitriles including acetonitrile and benzonitrile; nitropropane; propylene carbonate, and ethyl-3-ethoxypropionate.
  • C 1 to C 12 alcohols including isopropanol and benzyl alcohol
  • ethers of ethylene and propylene glycols and their esters C 3 to C 12 ketones including acetone, diacetone alcohol and acetophenone
  • acetate esters of C 1 to C 12 aliphatic alcohols organic nitriles including acetonitrile and benz
  • the second type of nonhalogen-containing solvents is a high flash point, highly aromatic blend of hydrocarbons often referred to as "aromatic naphtha" .
  • aromatic naphtha examples are Exxon Chemicals' Aromatic 150, Shell Chemicals' Cyclo Sol 63, Amoco's Panasol AN-3N, and Texaco's Aromatic Solvent 400, each of which contain mainly C 8 and higher alkyl benzenes and/or naphthalenes.
  • This second type of solvent may make up 10 to 60% by weight of the paint remover composition. Although these solvents serve primarily to maximize cost-performance of the remover mixture, for certain coatings such as alkyd enamels, the mixture of aromatic solvent and dibasic ester solvent provides enhanced removal action.
  • the Aromatic 150 solvent is a high purity aromatic mixture of C 9 to C 12 aromatics.
  • the mixture contains about 8% C 9 aromatic compounds, about 74% C 10 aromatic compounds, about 15% C 11 aromatic compounds, and about 1% C 12 aromatic compounds, and about 1% of nonaromatic compounds.
  • This mixture has a flash point of 150° F. (Flash point is defined as the temperature at which a liquid gives off a vapor sufficient to form an ignitable mixture with air near the surface of the liquid.)
  • dibasic ester containing about 17% by weight dimethyl succinate, 66% by weight dimethyl glutarate, and 17% by weight dimethyl adipate
  • Aromatic 150 14.5 parts by weight Aromatic 150
  • Example I The compositions obtained from Example I and II were tested for their ability to remove various paints from pineboard surfaces. Eight different painted surfaces were employed in the test. The samples are identified and characterized in Table I below:
  • each sample had three layers of paint.
  • Example II The compositions of Example I and II, as well as two different commercially available methylene chloride based paint removers were applied with a brush to different portions of each of the eight panels. After 20 minutes the panels were scraped. The results are tabulated below in Table II. Table II shows the relative results of the paint removers, i.e., a rating of 1 means that on that particular panel this sample removed more paint or more paint layers, or exposed more wood grain than the other paint removers shown, while a rating of 4 means that on that particular panel, the sample removed less paint or less paint layers or exposed less wood grain than the other paint removers shown.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

A low toxicity paint remover composition containing C1 to C4 dialkyl esters of C4 to C6 aliphatic dibasic acid, an activator, a thickener, a surfactant and at least one other organic nonhalogen-containing solvent.

Description

FIELDS OF THE INVENTION
This invention relates to a composition of matter suitable for use as a paint remover. The composition is less hazardous to use than conventional paint remover.
BACKGROUND OF THE INVENTION
A common commercially available class of paint remover contains a high percentage of methylene chloride. Although methylene chloride based paint removers are inexpensive and quite effective, such paint removers may be hazardous to the health of the user if not properly handled. U.S. Pat. No. 2,507,983 discloses methylene chloride based paint removers.
As a less hazardous substitute for methylene chloride based paint removers, N-methyl-2-pyrrolidone based materials have been proposed. Such materials are effective, but also quite expensive. Paint removers based on N-methyl-2-pyrrolidone are disclosed in U.S. Pat. No. 4,120,810.
As another substitute for the more toxic methylene chloride based paint removers, compositions containing dialkyl esters of succinic glutaric and adipic acid have been disclosed. German Pat. No. 3,438,399 (granted Mar. 20, 1986) shows such a paint removing composition.
SUMMARY OF THE INVENTION
The present invention is a paint removing composition which comprises (a) at least 20% by weight of, at least one C1 to C4 dialkyl ester of a C4 to C6 aliphatic dibasic acid, (b) 0.1 to 5% by weight of an activator, (c) an effective amount of a thickener, (d) an effective amount of a compatible surfactant, and (e) from 1 to 80% by weight of at least one nonhalogen-containing-organic solvent.
Activators for the paint removers of this invention are of two different types, i.e., basic activators such as ammonium hydroxide and monoethanolamine, and acidic activators such as formic acid, acetic acid and oxalic acid.
Suitable nonhalogen-containing-organic solvents are preferably those that have high flash points, i.e., above about 140° F. Such solvents include N-methyl-2-pyrrolidone, esters of monoalkyl ethers of dipropylene glycol, and esters of monoalkyl ethers of tripropylene glycol, and blends of hydrocarbons sometimes called "heavy aromatic naptha"--See U.S. Pat. No. 4,120,810, column 3.
The composition of the invention also contains an effective amount of at least one thickener. Suitable thickeners for paint removers are known in the art and include ethylcellulose, hydroxypropyl cellulose, organic modified clay and hydrogenated castor oil. The amount of thickener required depends in part on the other ingredients present in the composition, but in general an amount between about 0.5 and 10% by weight is effective.
The final ingredient required by the composition is an effective amount of a compatible surfactant. The surfactant is primarily included in the composition to enhance the water wash of the substrate to remove the paint residue and the other ingredients from the substrate. Suitable surfactants include potassium oleate, the dioctyl ester of sodium sulfosuccinic acid, sodium alkyl napthalene sulfonate, sodium alkyl benzene sulfonate and the like.
DETAILED DESCRIPTION
The paint remover of this invention comprises at least 20% and preferably at least 40% by weight of at least one C1 to C4 dialkyl ester of at least one C4 to C6 aliphatic dibasic acid. The dialkyl ester in most cases will be of a mixture of C4 to C6 aliphatic dibasic acid. Mixtures of C4 to C6 dibasic acids are a byproduct of the manufacture of adipic acid--an acid that is used commercially on a large scale in the production of some types of nylon. Suitable dialkyl esters for use in the present invention are obtained by the esterification of such a byproduct stream. The composition of such a byproduct stream varies considerably, but in general will contain about 15 to 30 percent succinic acid, 50 to 73 percent glutaric acid, and about 6 to 25 percent adipic acid. The methyl esters of such a mixture of acids is usually the most economically attractive, but ethyl, propyl and butyl esters are also useful.
The other solvent in the paint remover is a nonhalogen-containing-organic solvent. Nonhalogen-containing solvents which may be used in conjunction with the dibasic ester are of two types. One is a functional group-containing solvent which can have the effect of increasing removal effectiveness on a particular type of substrate or can modify the performance of a thickener. This type solvent may make up 1 to 50% by weight of the paint remover composition. Preferred are high flash point solvents such as N-methyl-2-pyrrolidone, and esters of dipropylene and tripropylene glycol ethers. Other nonhalogen-containing solvents which can be used but may be less desirable because of toxicity, cost, odor or volatility are C1 to C12 alcohols, including isopropanol and benzyl alcohol; ethers of ethylene and propylene glycols and their esters; C3 to C12 ketones including acetone, diacetone alcohol and acetophenone; acetate esters of C1 to C12 aliphatic alcohols; organic nitriles including acetonitrile and benzonitrile; nitropropane; propylene carbonate, and ethyl-3-ethoxypropionate. The second type of nonhalogen-containing solvents is a high flash point, highly aromatic blend of hydrocarbons often referred to as "aromatic naphtha" . Examples are Exxon Chemicals' Aromatic 150, Shell Chemicals' Cyclo Sol 63, Amoco's Panasol AN-3N, and Texaco's Aromatic Solvent 400, each of which contain mainly C8 and higher alkyl benzenes and/or naphthalenes. This second type of solvent may make up 10 to 60% by weight of the paint remover composition. Although these solvents serve primarily to maximize cost-performance of the remover mixture, for certain coatings such as alkyd enamels, the mixture of aromatic solvent and dibasic ester solvent provides enhanced removal action.
The Aromatic 150 solvent is a high purity aromatic mixture of C9 to C12 aromatics. The mixture contains about 8% C9 aromatic compounds, about 74% C10 aromatic compounds, about 15% C11 aromatic compounds, and about 1% C12 aromatic compounds, and about 1% of nonaromatic compounds. This mixture has a flash point of 150° F. (Flash point is defined as the temperature at which a liquid gives off a vapor sufficient to form an ignitable mixture with air near the surface of the liquid.)
EXAMPLE I
The following ingredients were mixed in a closed container:
39.5 parts by weight dibasic ester (containing about 17% by weight dimethyl succinate, 66% by weight dimethyl glutarate, and 17% by weight dimethyl adipate)
5.0 parts by weight N-methyl-2-pyrrolidone
2.5 parts by weight ethyl cellulose
2.0 parts by weight potassium oleate
1.0 parts by weight acetic acid.
EXAMPLE II
The following ingredients were mixed in a closed container:
25.0 parts by weight of the dibasic ester of Example I
5.0 parts by weight of N-methyl-2-pyrrolidone
14.5 parts by weight Aromatic 150
1.0 parts by weight monoethanolamine
2.5 parts by weight ethyl cellulose
2.0 parts by weight potassium oleate.
Paint Removal Results
The compositions obtained from Example I and II were tested for their ability to remove various paints from pineboard surfaces. Eight different painted surfaces were employed in the test. The samples are identified and characterized in Table I below:
              TABLE I                                                     
______________________________________                                    
Sam-             Solvent                                                  
ple  Paint       or water                                                 
No.  Type        based    Brand        Color                              
______________________________________                                    
                Primer                                                    
1    Latex exterior                                                       
                 Water    Bruning 1210 Under-                             
                                       White                              
     enamel               coat                                            
2    Alkyd enamel                                                         
                 Solvent  Bruning 1210 Under-                             
                                       White                              
     exterior             coat                                            
3    Lacquer     Solvent  Parks Gloss Lacquer                             
                                       Clear                              
4    Vinyl acrylic                                                        
                 Water    Bruning 1210 Under-                             
                                       White                              
     interior             coat                                            
5    Epoxy       Solvent  Bruning 1210 Under-                             
                                       White                              
                          coat                                            
6    Polyurethane                                                         
                 Solvent  McCloskey Gloss                                 
                                       Clear                              
     varnish              Polyurethane                                    
7    Marine paint                                                         
                 Solvent  Pettit Specialty Fiber-                         
                                       White                              
                          glass Undercoat                                 
8    Marine varnish                                                       
                 Solvent  McCloskey    Clear                              
                          Man-O-War                                       
                          Gloss Spar                                      
                First Coat                                                
1    Latex exterior                                                       
                 Water    Muralo Latex High                               
                                       Red                                
     enamel               Gloss Enamel                                    
2    Alkyd enamel                                                         
                 Solvent  Bruning House And                               
                                       Red                                
     exterior             Trim                                            
3    Lacquer     Solvent  Parks Gloss Lacquer                             
                                       Clear                              
4    Vinyl acrylic                                                        
                 Water    Muralo Semi Gloss                               
                                       Red                                
     interior             Vinyl Acrylic Latex                             
5    Epoxy       Solvent  Bruning Chemical Re-                            
                                       Purple                             
                          sistant Modified                                
6    Polyurethane                                                         
                 Solvent  McCloskey Gloss                                 
                                       Clear                              
     varnish              Polyurethane                                    
                          (Thinned 20%)                                   
7    Marine paint                                                         
                 Solvent  Pettit Easypoly High                            
                                       Orange                             
                          Gloss Marine                                    
8    Marine varnish                                                       
                 Solvent  McCloskey    Clear                              
                          Man-O-War Gloss                                 
                          Spar (Thinned 20%)                              
                Second Coat                                               
1    Latex exterior                                                       
                 Water    Muralo Latex High                               
                                       Grey                               
     enamel               Gloss Enamel                                    
2    Alkyd enamel                                                         
                 Solvent  Bruning House And                               
                                       Grey                               
     exterior             Trim                                            
3    Lacquer     Solvent  Parks Gloss Lacquer                             
                                       Clear                              
4    Vinyl acrylic                                                        
                 Water    Muralo Semi Gloss                               
                                       Grey                               
     interior             Vinyl Acrylic Latex                             
5    Epoxy       Solvent  Epoxy Coating #660                              
                                       Grey                               
                          White Base                                      
6    Polyurethane                                                         
                 Solvent  McCloskey Gloss                                 
                                       Clear                              
     varnish              Polyurethane                                    
7    Marine paint                                                         
                 Solvent  Finish       Grey                               
8    Marine varnish                                                       
                 Solvent  McCloskey    Clear                              
                          Man-O-War Gloss                                 
                          Spar (Thinned 20%)                              
______________________________________
As can be seen from Table I each sample had three layers of paint.
The compositions of Example I and II, as well as two different commercially available methylene chloride based paint removers were applied with a brush to different portions of each of the eight panels. After 20 minutes the panels were scraped. The results are tabulated below in Table II. Table II shows the relative results of the paint removers, i.e., a rating of 1 means that on that particular panel this sample removed more paint or more paint layers, or exposed more wood grain than the other paint removers shown, while a rating of 4 means that on that particular panel, the sample removed less paint or less paint layers or exposed less wood grain than the other paint removers shown.
              TABLE II                                                    
______________________________________                                    
Panel #   Ex. I  Ex. II    Control 1**                                    
                                   Control 2***                           
______________________________________                                    
1         1      2         3       4                                      
2         3      4         1       2                                      
 3*                                                                       
4         1      4         2       3                                      
5         3      4         2       1                                      
6         1      4         2       3                                      
7         3      4         2       1                                      
8         1      4         2       3                                      
______________________________________                                    
 *All four of the paint removers removed all of the paint on this panel.  
 **Control 1 is a commercially available methylene chloride based paint   
 remover which also contains mineral spirits and methanol.                
 ***Control 2 is a commercially available methylene chloride based paint  
 remover which also contains methanol.

Claims (10)

I claim:
1. A paint removing composition consisting essentially of (a) at least 20% by weight of at least one C1 to C4 dialkyl ester of a C4 to C6 aliphatic dibasic acid, (b) 0.1 to 5% by weight of an activator, selected from the group consisting of formic acid, acetic acid and oxalic acid or selected from the group consisting of ammonium hydroxide and monoethanolamine, (c) an effective amount of at least one thickener, (d) an effective amount of a compatible surfactant, and (e) from 1 to 80% by weight of at least one nonhalogen-containing-organic solvent.
2. The composition of claim 1 which consists of the listed components, and in which the nonhalogen-containing-organic solvent is selected from the class consisting of high flash point solvents.
3. The composition of claim 2 in which the high flash point solvent is at least one member of the group consisting of N-methyl-2-pyrrolidone, esters of monoalkyl ether dipropylene glycol, and esters of monoalkyl ether tripropylene glycol.
4. The composition of claim 1 in which the nonhalogen solvent is a blend of aromatic hydrocarbons.
5. The composition of claim 1 in which the thickener is present in an amount of 0.5 to 10% by weight.
6. The composition of claim 5 in which the thickener is selected from the class consisting of ethyl cellulose, hydroxypropyl cellulose, organic modified clay, and hydrogenated castor oil.
7. The composition of claim 1 in which the surfactant is selected from the class consisting of potassium oleate, dioctyl ester of sodium sulfosuccinic acid, and sodium alkyl napthalene sulfonate.
8. The composition of claim 1 in which the activator is ammonium hydroxide, and the nonhalogen-containing-organic solvent is N-methyl-2-pyrrolidone.
9. The composition of claim 1 in which the C1 to C4 dialkyl ester of a C4 to C6 aliphatic dibasic acid is present in the amount of at least 40% by weight, and the nonhalogen-containing organic solvent is present in the amount of between 1 and 60% by weight.
10. The composition of claim 1 in which the nonhalogen-containing-organic solvent is N-methyl-2-pyrrolidone, and the activator is acetic acid.
US07/039,117 1987-04-16 1987-04-16 Paint remover Expired - Fee Related US4780235A (en)

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Cited By (104)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4867800A (en) * 1988-07-21 1989-09-19 E. I. Du Pont De Nemours And Company Cleaning composition of terpene compound and dibasic ester
US4927556A (en) * 1987-06-04 1990-05-22 Minnesota Mining And Manufacturing Company Aqueous based composition containing dibasic ester and thickening agent for removing coatings
US4934391A (en) * 1988-02-08 1990-06-19 501 Petroleum Fermentations N.V. Dibasic esters for cleaning electronic circuits
EP0389829A1 (en) * 1989-03-13 1990-10-03 BASF Corporation Water based paint stripper and varnish remover for wood
DE4003700A1 (en) * 1989-07-11 1991-01-24 Scheidel Georg Gmbh PREPARATION FOR REMOVING COATINGS AND ADHESIVES
WO1991000893A3 (en) * 1989-06-30 1991-02-21 Stevens Sciences Corp Paint stripper and varnish remover compositions and related methods
WO1991003522A1 (en) * 1989-08-30 1991-03-21 Leys Cassius W Cleaner for treating a surface
US5011621A (en) * 1990-06-04 1991-04-30 Arco Chemical Technology, Inc. Paint stripper compositions containing N-methyl-2-pyrrolidone and renewable resources
US5011620A (en) * 1989-08-07 1991-04-30 E. I. Du Pont De Nemours And Company Cleaning composition of dibasic ester and hydrocarbon solvent
US5015410A (en) * 1990-02-20 1991-05-14 Arco Chemical Technology, Inc. Paint stripper compositions containing N-methyl-2-pyrrolidone, aliphatic hydrocarbons, and aromatic hydrocarbons
US5030290A (en) * 1988-12-29 1991-07-09 Elvert Davis Paint stripping compositions and method of using same
US5045224A (en) * 1988-01-12 1991-09-03 Toyota Jidosha Kabushiki Kaisha Color-change washing solution, suitable for spray coating devices
US5049300A (en) * 1990-10-01 1991-09-17 Creativity Technologies Group, Inc. Method of activating acidified NMP to provide an effective paint remover composition
US5049314A (en) * 1989-08-24 1991-09-17 Chute Chemical Company Paint stripping composition consisting essentially of NMP and ethyl-3-ethoxy propionate
US5084200A (en) * 1989-08-07 1992-01-28 E. I. Du Pont De Nemours And Company Cleaning composition of dibasic ester, hydrocarbon solvent, compatibilizing surfactant and water
US5089164A (en) * 1990-12-26 1992-02-18 Stanley Donald E Multi-purpose paint and varnish stripper
US5096501A (en) * 1990-08-27 1992-03-17 E. I. Du Pont De Nemours & Company Environmentally safe cleaning process and cleaning composition useful therein
US5098592A (en) * 1990-10-01 1992-03-24 Creative Technologies Group, Inc. Method of activating n-methyl-2-pyrrolidone (nmp) and/or delta-butyrolactone (blo) varnish and paint remover solvents
WO1992005224A1 (en) * 1990-09-14 1992-04-02 Dormon Brailsford Michael Ivor Paint system for removing paint
US5106525A (en) * 1991-04-12 1992-04-21 Arco Chemical Technology, L.P. Paint stripper compositions containing gamma-butyrolactone
US5124062A (en) * 1989-06-30 1992-06-23 Stevens Sciences Corp. Paint stripper and varnish remover compositions, methods for making these compositions and methods for removing paint and other polymeric coatings from flexible and inflexible surfaces
US5154848A (en) * 1990-10-01 1992-10-13 Verona Inc. Method of activating N-methyl-2-pyrrolidone (NMP) with ethyl 3-ethoxypropionate (EEP) to provide improved varnish and paint remover solvents
WO1992019710A1 (en) * 1991-05-09 1992-11-12 E.I. Du Pont De Nemours And Company Solvent composition
US5167853A (en) * 1989-06-30 1992-12-01 Stevens Sciences, Corp. Paint stripper and varnish remover compositions containing organoclay rheological additives, methods for making these compositions and methods for removing paint and other polymeric coatings from flexible and inflexible surfaces
US5178788A (en) * 1990-11-08 1993-01-12 Texaco Chemical Company Co-solvent system for removing cured fiberglass resin and cured flexible or rigid urethane foams from substrates
US5188675A (en) * 1990-09-14 1993-02-23 Dormon Brailsford Michael I Paint system for removing paint
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